Reinforced concrete construction.



2 SHEETS-sH-EET 1.

Patented Au 20, 1912. Q

J. WUNDER. REINFORCED CONCRETE CONSTBUQTION.

APPLICATION {ILED NOV. 29,1910

J. WUNDER. REINFORCED CONCRETE CONSTRUCTION. APPLIOATION rninn H0129, 1910.

Patented Aug. 20, 1-91 2.

ZSHEETB-SHEET 2.

JOHN WUNDER, OF MINNEAPOLIS, MINNESOTA.

REINFORCED CONCRETE CONSTRUCTION.

Specification of Letters Patent.

Patented Aug. 20, 1912.

Application filed November 29, 1910. Serial No. 594,745.

To all 'lF/LOIH it may concern:

Be it known that I, Jo n \Vunnnn, of h'linneapolis, county of Hennepin, and State of Minnesota. have invented certain Improvements in Reinforced Concrete Constructions, of which the following is a specification.

This invention relates to improvements in reinforced concrete constructions for buildings, and particularly the type known as fiat slab constructions.

The object of my invention is to provide a reinforced concrete tlat slab construction, that shall be simple and economical in construction, without beams or girders, and with the entire reinforcing means arranged either in the CUllll'llllS themselves or in the fiat slab floors, thus makino it unnecessary to employ reinforced capita ls, enlargements or brackets on the columns below the floors. By this means I am enabled to produce floor slabs that are joined directly to the columns, with all rtintorcing means arranged directly in the columns themselves, or between the uppe and lower surfaces of the flat floor slabs. While it. has been proposed prior to this invention to produce reinforced concrete constructions without beams or girders, l accomplish this result by means more edicient and economical than any heretofore produ ed, with which I am familiar.

The. invention consists generally in the constructions and combinations hereinafter described and particularly pointed out in the claims.

In the accompanying drawings forming part of this specification, Figure l is a vertical section of, a reinforced column and a portion of a flat floor slab foruual integrally therewith and embodying my invention. Fig. 2 is a plan view showing; the arrangement of the reinforcing means at the head of the column, which reinforcing means, when the structure is completed, are embedded within the Hat floor slab. Figs. 3 and 4. are, respectively. a plan view and a transverse section of the cast plate. that is located at the head of tho column and within the tint tloorslab. Fig. 5 is a detail showing the tru s rods that are used in c nn tion with the plate shown in Figs. 3 and l. bi (I- a partial plan view ,llt \\lll, ,l' thc reinforcing devices at the head of the columns, and the series of slab rods which are embedded in the floor slab. Fig. 7 shows a modified arrangement of the cast plate. Fig. 8 is a transverse horizontal section of one of the columns.

In all of the drawings, 1 represents one of the reinforced concrete supporting columns. This column is provided with a series of column rods 2, which may be formed in suitable lengths, and which are preferably arranged within the outer circumference of the supporting column. and are surrounded by spirally wound rods 3 which hold said column rods in position. The different sections of rods are arranged in alinement with one another and the sections may be united by suitable sleeves 1, formed of gas pipe or other suitable material, as shown in Fig. 1 of the drawings. Arranged at the head of each column, in position to be embedded within the floor slal) that is formed integrally with the cohnnn, I provide a plate 5, preferably of cast metal, having a central opening (5 through which concrete can be poured or passed for the purpose of forming the column, and embedding the rods 2, and

the spirally wound rods 3 therein. This.

plate is also provided with a series of holes 7 through which the column rods pass, and by which they are held in proper position while the concrete for the cohunn is being poured. This plate also has, preferably, an upwardly projecting annular rib (J, and a series of short radial ribs 7', cxtcnding'froni the rib (3 to points near the edge of the plate. The plate is also 'n'efcrably provided with a series of holes 8 for the purpose of causing adhesion bctwceh the concrete slab and said plate. I also prefer to provide a transverse hole 5) through each of the ribs 7 at a point near the annular rib (1. In connection with this plate l provide a so rics of looped rods l-t of substantially U- shape that are passed through the holes 9 in the ribs 7 of the plate 5. and which extend in radial directions from the center f the column. These rods preferably pass over rods 11. arranged at and forming the outer edge of the olumn head. The r ds ll extend horizontally 2X!'H H the annular rib t; on the metal plate 5 and said rod are bentat their ends to form the connecting parts 12 and 13, and theymay be tied together by wires 13 or other suitable devices. The ends of the U-shaped bars 14 are preferably bent 5 downward as shown in Fig. 1 of the drawings and extend practically to a point flush with the outer surface of the floor-slab. I may, in addition, provide at points between the members of the U-shaped rods 14 and the transverse rods 11. suitable U-shaped rods or bars 16, said U-shaped rods 16 form ing girders arranged between the rods 14 and the rods 11 and substantially parallel therewith. One end of each U-shaped rod 16 is shorter than the other, and the longer portion has preferably a downwardly turned F end 17, which projects downwardly at a point near the center of the reinforced columns. The short end of the rod 16 bears against the outer surface of the upwardly projecting annular rib 6 on the plate 5, which forms an abutment for said rod. The rods 16 are preferably turned by heavy wire 16 wrapped about its members as shown.

The U-shaped rods 16, it will be noted, are arranged with their members in the same vertical plane and they extend horizontally into the floor slab as far as it is deemed necessary to carry them.

When the plate 5 is arranged as shown in Figs. 1 and5 of the drawings its under surface is substantially flush with the surface of the ceiling or under surface of the flat slab. In some instances however it is desirable to protect this plate 5 against fire and then I may arrange the plate 5 at a slightly higher point within the flat slab and-have the concrete surface extend under the plate. In Fig. 7 of the drawings I have shown a wire-netting 20 extending under the plate 5 and the shortdistance below the same with portions thereof pulled upward through the holes 8 in the plate 5. \Vith this arrangement a layer of concrete of any desired thickness may be extended across the under surface of plate 5 so as to protect the same in case of fire.

It will be noted that the plate 5 together with the rods 11 with their connecting parts 12 and 13 and the U-shapcd rods or bars 14 and 16 all constitute together a column head and arc embedded within the Hat slab forming the floor. The U-shaped rods 14 and It; may be used together or one series of these rods may be omitted and the other alone employed. These U-shaped rods are shear members and resist the shear strain. which comes around the column and is taken up by the head formed as hcreinbefore described. It is essential to provide members for resisting the shear stress and to have the same embedded in the flat slab construction where heavy loads are to be carried.

After the column heads have been put in 5 position as described the slab rods 21, 22.

and 23 are carried across the column heads and across the spaces between the columns substantially as illustrated in Fig. 6 of the drawings and these slab rods transmit the, bending strains from the spans of concrete extending from one column to another.

I have shown in Fig. 1 of'the drawings a series of standards 25 embedded in the concrete and supporting strips of wood embedded in the concrete as indicated by the dotted line in the upper partof the floor slab. These strips of wood are for the purpose of permitting a wooden floor to be nailed on to of the flat slab of concrete and the standar s 25 are put in position restin on the false work when the same is erected and before the floor slabs are poured. These standards are left embedded in the concrete and they form su ports for the floor strips while the flat sla s are being poured.

It will be obvious that the details of the construction may be modified in many particulars without departing from my invention.

Having described my invention and set forth its merits what I claim is:

1. The combination, in a reinforced concrete building construction, with a series of reinforced columns each provided with vertical column rods, of a head for each column comprising a plate having a central opening, an annular rib on its upper surface and a series of radial ribs extending outward from said annular ribs and provided with openings, reinforcing rods extending across said plate above said annular rib, and U- shaped rods passin throu h the openin s in said radial ribs an exten ing radially rom the column centers, substantially as described.

2. In a reinforced concrete building construction, the combination, with a series of reinforced columns, of a metal plate for each column, having an open center, reinforcing rods extending across said plate and 110 forming a column head, and U-shaped rods arranged with their members in vertical planes, and each U-sha ed rod having one end bearing against sa plate and the other extending downward into the column near 115 its center, substantially as described.

In a reinforced concrete buildin construction, the combination, with a rein orced column, of a metal plate having an open center through which the concrete for the 001- 120 ums may be poured, said plate being also provided on its upper surface with an annular rib, reinforcing rods extending through said column and resting upon said annular rib, U-shaped rods extendin on radial lines 125 from said plate and having ownwardl y bent outer ends, and a flat concrete slab in which said plate and column-head'rods are em bedded, substantially as described.

4. In a reinforced concrete building con- 13c struction, the combination, with a reinforced column, of a metal plate arranged at scribed.

the column head, and provided with an an- In Witness whereof, I have hereunto set nular rib, a series of raldial rodsbextending my hand this 14th day of November 1910. transversely over said p ate and earing on T a said rib and having their outer ends con- JOHL WUNDhR' nected by diagonal extensions, U-sl1aped l Witnesses:

rods exten'ding outward from said plates, G. E. SoRENsEN,

and a concrete flat slab in Which'said plate E. A. PAUL.

and rods are embedded, substantially as de?- 10 

